diff options
| -rw-r--r-- | src/backenddb/versioning.sql | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/backenddb/versioning.sql b/src/backenddb/versioning.sql index 98e7f661..c7fa8121 100644 --- a/src/backenddb/versioning.sql +++ b/src/backenddb/versioning.sql @@ -146,12 +146,17 @@ BEGIN; +-- Added by Christian Grothoff to support concurrency, see +-- https://stackoverflow.com/questions/29900845/create-schema-if-not-exists-raises-duplicate-key-error?rq=4 +LOCK TABLE pg_catalog.pg_namespace; + + -- This file adds versioning support to database it will be loaded to. -- It requires that PL/pgSQL is already loaded - will raise exception otherwise. -- All versioning "stuff" (tables, functions) is in "_v" schema. -- All functions are defined as 'RETURNS SETOF INT4' to be able to make them to RETURN literally nothing (0 rows). --- >> RETURNS VOID<< IS similar, but it still outputs "empty line" in psql when calling. +-- >> RETURNS VOID<< IS similar, but it still outputs "empty line" in psql when calling CREATE SCHEMA IF NOT EXISTS _v; COMMENT ON SCHEMA _v IS 'Schema for versioning data and functionality.'; @@ -205,7 +210,7 @@ BEGIN RETURN; END; $$ language plpgsql; -COMMENT ON FUNCTION _v.register_patch( TEXT, TEXT[], TEXT[]) IS 'Function to register patches in database. Raises exception if there are conflicts, prerequisites are not installed or the migration has already been installed.'; +COMMENT ON FUNCTION _v.register_patch( TEXT, TEXT[], TEXT[] ) IS 'Function to register patches in database. Raises exception if there are conflicts, prerequisites are not installed or the migration has already been installed.'; CREATE OR REPLACE FUNCTION _v.register_patch( TEXT, TEXT[] ) RETURNS setof INT4 AS $$ SELECT _v.register_patch( $1, $2, NULL ); |